Punch



Mmh 3o, 1943;

A. W. KNUDSEN PUNCH Filed Aug. .25, 1941 3 Sheets-Sheet 2 FIGA INVENTOR.

BY ALEX w. KNUDSEN.

A. w. KNuDsl'EN 2,315,340

March 3o, 1943.

' Filed-Aug. 25, 1941 Fie NT. ALEX W KNUD EN v y INVE OR.

Patented Mar. 30, 1943 PUNCH vAlex W. Knudsen, Rocky River,`hio, yass'ignorto The Midland -Steel Products Company, -`Cleve land, "Ohio, va corporation -of Ohio Application-August 23, 1941, Serial No.-408',075

8 Claims.

`punches without subjecting thel punch :operating means l toshearing stress.

Another important object of the invention is to provide a floating combined-work holder and punch `carrier between the bed-and the ram with multiple horizontal punches arranged lradially about the center of the work holder with'the provision of straight line thrust posts ion'theram Afor moving the combined work holder andpunch carrier downwardly toward thebed toisimultanelously project the punchesfthrough'the-work .and

at Athe same time compressspring means :forelevating the Acombined work #holder and punch carrier to Iautomaticallysimultaneously: cause Aretractionof the :punches .from the workfupon elevation of the ram.

Other objects and advantages of the invention will =become apparent .during the course ofthe following description.

In the accompanying drawings forming AIa ,apart ,of .the application and wherein 'like numerals vareemployed-to designate likeparts throughout the several views:

Fig. 1 is a vertical :off-center section Vof the attachment secured to a Apower driven punch press illustratingthe relative :position of Ith-e parts with the multiple punches-projectedthroughthe work, and for further reference yis taken upon the lineI-I of Fig.v3.

Fig. 2 isa horizontal section through -thefat tachment taken on `the-lineZ---Zfof Fig. 1,

Fig. 3 is another horizontal section taken `on the line 3-3 of Fig. 1,

Fig. 4 .is -a vertical section of the part of the =devicetaken on the line vlI-JI of Fig. (Land Fig. 5 is a fragmentary section of a portion yof the combined work holder and punch'ca-rrier illustrating the relative 'position of parts when the punches are withdrawn bythe cam means from the work.

Referring now more in vdetail to the'd-rawings,

the .numeral B desi'gnatesaplate attached to the ram :of -a power driven punch A press and is :adapted to #reciprocate relative -to 'a Ibase or rbed f1 vof the press. rSecured to the ram plate by means of `bolts -8is a top plate`9 depending fromwhich are three vertical thrust posts '.IIl. AThisplate 9 is 'provided iwith four cavities `II in which are disposed compressionfsprings I 2fto :engage apressure pad ISadapted toexercise'the proper pressure upon the 'work'l4 by reason of its beingfslid- 'ably 'mounted `upon 'four screws I5 lsecured in the rplate 9 arranged'at the four corners of the 'pressure pad Vbeyond the circumference of the work I4. The=work in this instance is illustrated as a lhollow cylindrical body havinga closedend Yand Yan open end, ?the latter being 'adapted to have 'formed therein six equi-distantly spaced holes for perforations.

AThe bedplate VI6 is secured to the bed I of the presspby means o'f `four bolts I'I and'is provided Witha central discharge opening Iliff-or 'theslugs :punched from 'the work aswill :'be hereinafter described. This bedplate uIt is provided with six circular openings radially 'of its center in which are disposed six fcylindrcal studs vhaving their upper .ends :2 0 formed into cams having .op- ,fposedinclinedfaces to -both project land retract :punch holders :which lwill be later described. 'Rising :from the bed plate I6 `are three limit screws 2| 'havng'enlarged-hea'ds l22 for limiting `the :upward movement of the combined work vholderIand punch -carrier-as willbe-presently described. The bed plate is 'also provided With a pair pf Ycavities 23 'between each pair'of `posts Vor 'studs I'Bforithereception of ycompressi-'on spring-s 24,-:m-aking Zatotal of fone-dozen springs 24 projecting 'above the fplate I6 to be receivedin re- 'cessesiinthe bottom'ofzthe combined work holder 'andpunch `carrier :25 Ito elevate andito floatingly support the same. The combinedwork holder 'and `punch carrier is composed of a disk 26 having a central'vertical opening .21 vand-six radially disposed equi-distantly spaced circular openings 28 so as to V be Vslidably received upon the six cam studs TI-SJ and be ynormallyretainedpr supported bythe springs' 24 inthe-elevated position shown :in Fig. 5. Above 'each .circular opening 28 the disk26 :is vprovided witha radial wide groove 29 vto slid'ably receive a block shaped vpunch holder 30. Awearresisting'plate 3-I yin the jf'orm of an insert in the disk ima-y'be 'sunkV into the'bottom of each groove to reduce wear imposedby recip lrocations .of the punch'holderw. If desired, the Vradial grooves vfor the punch :holders may be :formed Yby lbolting a plurality sof Kequally spaced segmental blocks upon `'the disk '26 fandfast'ening them thereto by means of bolts 32. The upper surface of the disk 26 is provided with azcount'er- .sunk recess for v'each ubolt 2l :and .rin which the heads T22 of these :bolts :bottom when the tSprings 24 elevate the punch carrier upon elevation of the ram plate 6.

A punch carrier is provided with a central depression 33 to receive a circular work support 34 having an external shoulder upon which the cylinder I4 is disposed to be retained in position during the perforating operation of its rim adjacent its lower open end. The circumference of this work holder above the external shoulder is provided with six equi-distantly spaced perforating dies 35 into which project the punches 36, after they have punctured or perforated the work I4 to move a slug 31 into the perforating die. The work holder is provided with a radial passage 38 for each perforating die to receive the slugs as they are successively punched out to be deposited into the central opening 3B in the work holder where they pass down through the opening 2l' in the punch carrier and on into the opening I8 of the base plate I6 to be suitably discharged therefrom.

Each punch holder is provided with a downwardly and inwardly inclined opening with opposed parallel inclined walls to engage and slide upon the opposed inclined walls of the cams 20 so that upon elevation of the punch carrier under the influence of the springs 24, all of the punch holders 3U are simultaneously moved outwardly to retract their punches 36 from the work and clear the same in order that the Work can be readily removed from the holder 34 when the press ram has been elevated. The punch holders 38 are retained in their respective grooves by means of a cap plate 4I bolted by bolts 42 and 32 to the top of the carrier disk 25. This cap plate is provided with three pressure buttons 43 to receive the thrust of the ram through the three posts I!! and are housed in the bottom of three vertical guide tubes 44 bolted to the cap plate by means of the bolts 45.

After the Work I4 has been placed with its open end circling the work holder 34, the press is tripped to cause the ram to descend with the pressure plate I3 while the thrust posts IU engage the buttons 43 and move the combined work holder and punch carrier downwardly thereby causing the individual punch holders 3B to automatically and simultaneously move inwardly upon the cam heads 20 and force their punches 36 through the work I4 and into the perforating dies 35 to perforate the rim of the cylinder in six different places simultaneously. By supporting the cam elements on short studs from the base plate I6. the thrust posts Il] may exert their pressure in a straight line upon the work and punch holder thereby obviating much of the usual undesirable shearing stress upon the operating parts. As the cushioning springs 24 elevate the carrier 25, after the perforating operation, the heads 22 of the bolts 2| limit the upward movement of the carrier while the ram travels further upwardly until the pressure pad I 3 comes to a stop against the heads of the bolts I5 and clears the top of the cam suiliciently for it to be lifted off of the Work holder 34 and another Work piece I4 can be readily positioned thereon as rapidly as the power press Will operate.

It will be understood that various changes in the size, shape `and relation of parts may be resorted to without departing from the spirit of the invention or the scope of the appended claims.

I claim:

1. A punch press attachment for punching a horizontal hole in a vertical work piece Wall comprising stationary vertical guide pins secured to the bed of the press, a vertically movable punch carrier encircling said pins and being slidably mounted for limited vertical movement upon said pins, a cam on each pin, a punch holder operated by said cam and reciprocably mounted in said carrier, and thrust posts depending from the ram of the press and adapted to engage said carrier to move the same downwardly as the punch holder is moved inwardly by said cam.

2. A multiple punch comprising a plurality of stationary pins disposed radially about a center and each having a two-faced inclined cam, a reciprocable work and punch carrier encircling said pins and being mounted for reciprocation upon said pins, a punch holder reciprocably mounted in said carrier about each pin and having an inclined opening to receive said two faced cam to be radially reciprocated upon reciprocation of said carrier, and `a work holder centralized with respect to said pins on said carrier and adapted to reciprocate with the latter as the punch holders move in and out as they are reciprocated by the carrier moving longitudinally upon said pins.

3. A multiple punch comprising a plurality of vertical pins radially arranged with respect to a center and having their upper ends provided with opposed inclined faces, a punch carrier mounted for reciprocation upon said pins, a cylinder support on said carrier, said support having a plurality of radially disposed openings opposite portions of the cylinder to be perforated, a plurality of radially disposed punches each having an opening with opposed inclined sides complementary to said opposed inclined faces of said pins to be moved in opposite directions upon reciprocation of said punch carrier to simultaneously move said punches radially relative to said cylinder.

4. A multiple punch comprising a plurality of stationary pins disposed radially about a center, a reciprocable work and punch carrier mounted for reciprocation upon said pins, spring means for normally elevating said carrier, said carrier having a plurality of radial grooves, the upper end of each of said stationary pins being formed into a double faced cam, each projecting into its respective groove, a punch holder reciprocably mounted in each groove and having an opening with opposed inclined faces for engagement with the double faced cam of its respective pin, a work holder mounted on said carrier and centralized with respect to said radially disposed punch holders, and means for moving said carrier against the tension of said spring means to cause the punch holders to simultaneously move inwardly toward said work holder.

5. A multiple punch comprising a base, a plurality of vertical guide and cam pins Xed in said base, and each having a two faced inclined Cam, a vertically reciprocable work and punch carrier having portions encircling said pins and mounted for reciprocation upon said pins. a work holder mounted centrally upon said carrier and having radially disposed perforating dies, a punch holder reciprocably mounted in said carrier for each pin and having an inclined opening to receive said two faced cam and adapted to be reciprocated by said Work and punchvcarrier moving longitudinally upon said pins.

6. A multiple punch comprising a lxed base, a plurality ofv stationary pins fixed thereto radially about the center thereof, said pins each having its upper end formed into a two-faced inclined cam, a resiliently supported punch carrier encircling said pins and mounted i'or reciprocation upon said pins and having openings into which said cams project, and a, punch holder slidably mounted in each opening and having an oblique opening in which a portion of said double faced cam of a complementary pin is disposed at all times, and said cam being extended farther into said oblique opening when the punch holder is moved toward the work.

7. A vertical punch press comprising a ram and a base, a plurality of vertical pins xed in said base and each having a two-faced inclined cam, a. vertically reciprocable work and punch carrier encircling said pins and being mounted for reciprocation upon said pins, a, work holder mounted centrally upon said carrier and having radially disposed perforating dies, a punch holder reciprocably mounted in said carrier and having an inclined opening to receive said two faced cam, said ram having depending pressure posts adapted to engage said work and punchv carrier to move the same, and a spring pressure plate carried by said ram to yieldingly engage the work upon descent of the ram.

8, A power press having a ram and a base, a vertically movable die mounted thereon and having vertical guide sleeves, a Work support mountedupon said die to be moved therewith, means carried by said die for operating upon the work as the die is moved relative to said base, depending posts secured to said ram and operating in said guide sleeves to move the die downwardly,

and a work engaging member yieldingly mounted upon the ram to engage the work and to yield as they die is moving downwardly by said posts.

ALEX W. KNUDSEN. 

